(1)求椭圆E的方程;

(2)若直线y=x与椭圆E交于M、N两点(M点在第一象限),P、Q是椭圆上不同于M的相异两点,并且∠PMQ的平分线垂直于x轴.试求直线PQ的斜率.

A.(x-2)²+(y-1)²=1                             B.(x-3)²+(y-2)²=4

C.(x-3)²+(y-1)²=1                             D.(x-4)²+(y-2)²=4

已知双曲线的左、右焦点分别是、，其一条渐近线方程为，点在双曲线上.则?＝w.w.w.k.s.5.u.c.o.m                    

   A. －12             B.  －2            C.   0          D. 4

A.                        B.4                              C.2                              D.1

A.6                        B.4                       C.2                       D.1